麻豆淫院

On September 5, 2020, California's Creek Fire grew so severe that it began producing its own weather system. The fire's extreme heat produced an explosive thunderhead that spewed lightning strikes and further fanned the roaring flames, making containment elusive and endangering the lives of firefighters on the ground. These wildfire-born storms have become a growing part of fire seasons across the West, with lasting impacts on air quality, weather, and climate.

Until now, scientists have struggled to replicate them in Earth system models, hindering our ability to predict their occurrence and understand their impacts on the global climate. Now, a new study provides a breakthrough by developing a novel wildfire鈥揈arth system modeling framework.

The research, published in , represents the first successful simulation of these wildfire-induced storms, known as pyrocumulonimbus clouds, within an Earth system model.

Led by DRI scientist Ziming Ke, the study successfully reproduced the observed timing, height, and strength of the Creek Fire's thunderhead鈥攐ne of the largest known pyrocumulonimbus clouds seen in the U.S., according to NASA.

The model also replicated multiple thunderstorms produced by the 2021 Dixie Fire, which occurred under very different conditions. Accounting for the way that cloud development is aided by moisture lofted into the higher reaches of the atmosphere by terrain and winds is key to their findings.

"This work is a first-of-its-kind breakthrough in Earth system modeling," Ke said. "It not only demonstrates how extreme wildfire events can be studied within Earth system models, but also establishes DRI's growing capability in Earth system model development鈥攁 core strength that positions the institute to lead future advances in wildfire鈥揷limate science."

When a pyrocumulonimbus cloud forms, it injects smoke and moisture into the upper atmosphere at magnitudes comparable to those of small volcanic eruptions, impacting the way Earth's atmosphere receives and reflects sunlight. These fire aerosols can persist for months or longer, altering stratospheric composition.

When transported to polar regions, they affect Antarctic ozone dynamics, modify clouds and albedo, and accelerate ice and snow melt, reshaping polar climate feedbacks.

Scientists estimate that tens to hundreds of these storms occur globally each year, and that the trend of increasingly severe wildfires will only grow their numbers. Until now, failing to incorporate these storms into Earth system models has hindered our ability to understand this natural disturbance's impact on global climate.

The research team also included scientists from Lawrence Livermore National Laboratory, U.C. Irvine, and Pacific Northwest National Laboratory. Their breakthrough leveraged the Department of Energy's (DOE) Energy Exascale Earth System Model () to successfully capture the complex interplay between wildfires and the atmosphere.

"Our team developed a novel wildfire鈥揈arth system modeling framework that integrates high-resolution wildfire emissions, a one-dimensional plume-rise model, and fire-induced water vapor transport into DOE's cutting-edge Earth system model," Ke said.

"This breakthrough advances high-resolution modeling of extreme hazards to improve national resilience and preparedness, and provides the framework for future exploration of these storms at regional and global scales within Earth system models."